H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 1/52 (2006.01) H03F 3/30 (2006.01)
Patent
CA 2109755
An improved composite bridge amplifier having four semiconductor output transistors in a bridge configuration. The control terminals (gates or bases) of the transistors are controlled by an input signal which is amplified in a phase sputter and voltage gain stage and then applied to the control terminals. The output terminals of the transistors receive a power signal which varies with the input signal at a level sufficient to maintain headroom above the output signal but to reduce power dissipation in the transistors. The power signal is produced by a switch connected between a floating power supply and a filter and operated at e.g. 200 kHz. The switch is operated by a pulse width modulated (pwm) signal derived from the absolute value of the input signal. The improved composite bridge amplifier further includes a proportional integral controller coupled between the output of the filter and the pulse width modulator to provide closed loop feedback. The output of the filter is aligned with the input signal by a phase shifter which is connected to the proportional integral controller. Because the phase shifter eliminates the need for a time delay in the input signal (i.e. audio) path, high performance can be achieved with reduced cost. To further improve the performance of the amplifier at high frequencies, the improved amplifier includes a peak detector circuit for tracking a high frequency input signal and compensating the pwm signal. The improved amplifier also features thermal overload protection and output current overload protection circuits which protect the output stage by reducing the headroom. Because the protection circuits do not "clip" the output signal, the effect to the listener is minimized.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Blade Technologies Inc.
Indigo Manufacturing Inc.
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